The camp uses the double-axle trailer towed by a tractor to haul visitors' belongings to and from the camp, Bruster said. The belongings are loaded onto a ferry that travels across the Salmon River to the parking lot at Knight Park.

The tractor/trailer tandem was was taking items down to the ferry when the boy tried to jump up on the trailer. He fell off, slipped under the trailer's wheel and was run over, Bruster said. The driver did not see the boy.

The driver did not see the boy. Deputies determined the crash was accidental, not criminal.

Two doctors and a nurse were at the scene, and they started performing CPR on the boy, Bruster said. He was taken to Samaritan North Lincoln Hospital, where he died.

About 50 children, Bruster said, were at the camp at the time of the accident.